Calling any users of MSE

To anyone using MSE (Microsoft security essentials) if you search your PC for any files with a .vdm extension do you find any in strange places such as on another drive or partition. I have found they may not be indexed so look at the root of all drives.

This seems to be happening to a few users and provided the PC has seen a reboot since the files appeared they are apparently safe to delete (they are the delta virus/spyware updates). This only seems to be happening since the latest MSE updates.